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How to seal a leaking radiator 
Look for a rise in the temperature gauge. 
Your radiator dissipates heat to help maintain the optimal operating temperature for your vehicle's engine. A leak in your radiator will result in lost coolant, which will compromise the system's ability to reduce that temperature.
When your coolant system begins to fail, the temperature gauge on your dash board will climb. If your vehicle has been running consistently warmer or if you have recently begun having issues with overheating, you may have a leak in your radiator.